package cn.tedu.boot02.controller;

import cn.tedu.boot02.entity.User;
import cn.tedu.boot02.utils.DBUtil;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

@RestController
public class UserController {
    @RequestMapping("/reg")
    public String reg(User user) {
        System.out.println("user = " + user);
        try(Connection connection = DBUtil.getConnection()) {
            String sql = "SELECT id FROM user WHERE username=?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1, user.getUsername());
            ResultSet rs = ps.executeQuery();
            if(rs.next()) { // 为true 证明已存在用户
                return "用户已存在!";
            }
            //
            String insertSQL = "INSERT INTO user VALUES(NULL, ?, ?, ?)";
            PreparedStatement insertPS = connection.prepareStatement(insertSQL);
            insertPS.setString(1, user.getUsername());
            insertPS.setString(2, user.getPassword());
            insertPS.setString(3, user.getNickname());
            insertPS.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "注册成功!";
    }

    @RequestMapping("/login")
    public String login(User user) {
        System.out.println("user = " + user);
        try(Connection connection = DBUtil.getConnection()) {
            String sql = "SELECT password FROM user WHERE username=?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1, user.getUsername());
            ResultSet rs = ps.executeQuery();
            if(rs.next()) {
                String pw = rs.getString("password");
                if(pw.equals(user.getPassword())) {
                    return "登录成功!";
                }
                return "密码错误";
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "用户名不存在!";
    }
}
